Keyless socket



June 15', 1926.

C. S. MALLETT KEYLESS SOCKET Filed Dec. 51, iezs InVnjfir I Charles S. Mallet? His AtFSr-ngy Patented 1...... 15,- 1926. 1,589,298

UNITED STATES PATENT OFFICE.

CHARLES S. MALLETT, OF TORONTO, ONTARIO, CANADA, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

KEYLESS SOCKET. Application filed December 31, 1923, Seria1 No.- 683,625, and'in Canada October 26, 1923.

My invention relates to improvements in after assembly. The purpose of separating 55 keyless sockets and receptacles and the the arms is to avoid the rivet which unites object of the invention is to improve their the parts of the socket and thus electrically construction and also to reduce the cost of separate the center contact and shell parts. manufacturing by eliminating the operation 2-2 and 23, Fig. 2, are small sockets formed of threading of holes, which operation is in the insulating base and are adapted to 6 responsible for the major portion of the loss receive the tips 20 and 21 of arms 18 and 19 in the production of such sockets and re-. and thus. firmly hold the terminal in posiceptacles. tion. a

For a consideration of what I believe to 24 is a shallow recess formed in the leftbe novel and my invention, attention is dihand side of the base 4 and into which the 6 rected to the accompanying description and vertical portion of the shell terminal 14 the claims appended thereto. extends. 26 is a sheet metal screw shell pro- In the accompanying drawing, Fig. 1 is vided with a rectangular slot 27 extending a sectional view through my improved keydiametrically across it and partway down less socket or receptacle; Fig. 2 is a erthe sides thereof. Formed integral with the 7 spective detail of the insulating base; ig. base and extending into the slot 27 is a flat- 3 is a erspective detail of the center tersided projection 28 which engages the walls minal; i 4 is a perspective detail of the of the slot and prevents the shell from turnshell terminal; Fig. 5 is a erspective deing on the base when a lamp or other device tail of the screw shell, and Big. 6 is a plan is screwed into the shell. view of the insulating base. 29 and 30 are small holes or orifices in 1 indicates the metal casting of the socket the bottom of the shell on each side of the or receptacle which is provided with the slot 27, which when the parts are assembled usual insulating lining 2 and cap 3. 4 indiregister with the small sockets, 22 and 23' cates an insulating base which is made of in the base. The arms 18 and 19- of the porcelain or equivalent material and is proshell terminal extend through the slot 27 vided with a relatively deep central recess 5, and engage the under surface of the top the latter having a side opening 6 as shown of the shell at each side of the slot to estabin Figs. land 6 to receive one f the'circuit lish electrical connection. The extremities terminals. Centrally disposed in the hot- 20 and21 of the terminal extend upwardly tom of the base is a rivet-receiving opening. through the small orifices 29 and 30 into the 7 indicates a metallic terminal which is consockets 22 and 23 in the base 4. 31 is an innected to the center contact and comprises sulating washer or disk located within the an L-shaped strip having a rivet-receiving screw shell and which engages the arms 18 hole located near its inner' end. The vertiand 19 and presses them firmly against the cally-extending part 8 thereof is provided under side of the top of the screw shell. 32 is with a threaded hole 9 forthe reception of a hollow rivet or eyelet provided at its lower a screw. The upper end of the terminal is end with a head which engages the under outturned as indicated at 10 so that a circuit surface of the washer 31 and the stem therewire may be clamped between it and a of extends upwardly through the hole in clamping screw 11. i the center of the washer and between the 14 is a shell terminal which comprises a arms 18 and 19 of the shell contact, through strip 15, Fig. 4, provided with a screwthe center slot 27 in the shell and through receiving hole near its upper end, the por-- the hole in the bottom of the base into the tion of the strip above the hole being outcenter contact terminal 7. The upper end 9 turned as indicated at 17 to hold one of of the rivet or eyelet is flanged over this the circuit wires between it and a clamping center terminal thus securing all of the screw. The opposite or lower end of the parts together. The lower end of the rivet strip is forked to form two arms 18 and 19 forms the center contact of the socket or between which is a V-shaped space. The receptacle and is adapted to be engaged by extremities of the arms are upturned at 20 the lamp or other device when screwed into and 21 to form holding devices to prevent the shell. On the base are also radial prothe terminal from moving from its position jections 35 which engage inwardly extending projections formed on the surrounding metal casing to prevent relative annular movements of these parts.

It will thus be seen that when all the parts are assembled they are held together by means of the eyelet 32 thereby dispensing with the use of screws and therefore the formation of threaded holes in numerous small parts.

By securing all the parts of the socket together by a single member and dispensing with the use of screws, the cost of manufacture is materially reduced and losses incident to the rejection of defective pieces is decreased.

By utilizing a single piece porcelain base having a large central recess which opens at one side only, ample space is afforded to receive a tool for riveting over the edge of the eyelet without danger of injuring the porcelain. The L-shaped terminal 7 is prevented from twisting on the rivet by means of the side walls of the recess. The vertically-extending part 8 of the terminal being located as it is at the mouth of the side opening, is well separated from the outer shell thereby avoiding danger of short circuits due to careless wiring.

The terminal 1 f being on the opposite side of the vertical wall of the center recess is well insulated and is also separated from the casing by a substantial space.

lVhat I claim, as new and desire to secure by Letters Patent of the United States, is,

In a keyless socket or receptacle, the combination of a single piece insulating base having a relatively deep central recess which is open on one side, a screw threaded shell, the top of which is diametrically slotted, a terminal member which extends through the slot and is divided at one end into arms which engage the top of the shell to establish electrical contact therewith, the ends of said arms passing through the top of the shell and engaging the end of said member being arranged to receive a circuit wire, a terminal member which is located in the recess and extends through the side opening, an insulating disk inside of the shell, and a means which extends through the disk and base into the terminal in said recess and unites the shell, base and terminals.

2. In a keyless socket or receptacle, the combination of a single piece insulating base having a relatively deep central recess which is open on one side and a relatively shallow recess on the side opposite the opening, an L-shaped terminal member which is located in the central recess and extends through its open side, a sheet metal screw shell having a slot in its top, a shell terminal member, one end of which occupies the shallow recess, the other end being forked and extending through said slot and engaging the base, the opposite under surface of the top of the shell, positioning means integral with the shell terminal member which extend through the top of the shell and engage the base, an insulating washer in the shell, and a rivet which extends upwardly through the washer, slot in the shell, base and L-shaped terminal and unites said parts.

3. In a keyless socket or receptacle, the combination of a single piece insulating base having a relatively deep central recess which is open on one side, a terminal member which is located in the recess and extends through the open side, a screw shell having a central slot in its upper end and also a pair of holes, an insulating washer in the shell, a terminal member for the shell having a forked lower end which is situated between the washer and the shell andhas projections that enter said holes, and an eyelet which extends upwardly through the washer and slot and between the forked end of the shell terminal member into the base and first-named terminal and unites said parts.

4. In a keyless socket or receptacle, the combination of a single piece insulating base having a central side opening recess in its upper side and a pair of small sockets in its under side, a screw-threaded metal shell having a slotted top and a pair of holes which register with the sockets in the base, a washer in the shell, a terminal member which is located in the said recess, a second terminal member which extends through the slot in the shell and has a pair of arms which are situated between the Washer and the shell, the ends of which project upwardly through the holes in the shell into the sockets in the base, and a rivet which unites the terminals, base and shell and also forms the center contact of the socket.

5. In a keyless socket or receptacle, the combination of an insulating base having a central side opening recess in its upper and a straight sided projection and a pair of sockets on its under side,- a sheet metal screw shell having a slotted top, the side walls of which engage the projection to prevent relative movements of the parts, a center terminal member located in said recess, a shell terminal member having spaced arms which extend through the slot and engage the under side of the top of the shell, there being projections on the outer ends ofthe arms which extend through the top of the shell into the sockets in the base, a

washer in the shell, and a rivet which extends, through the washer, base and center terminal and unites the parts.

side

In witness whereof, I have hereunto set my hand this twenty-seventh day of December, 1923.

CHARLES s. MALLETT. 

